Mechanical lock mechanism and injector head using the mechanism
First Claim
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1. A mechanical locking mechanism comprising:
- a drive having a rotary shaft;
a moveable shaft capable of linear motion;
movable shaft drive means for converting rotary motion of the drive to motion of a prescribed direction in order to supply linear motion to said movable shaft; and
safety means for restraining rotation of the rotary shaft of said drive by a mechanical operation when said movable shaft moves beyond a predetermined position;
wherein said safety means includes a locking means provided in the vicinity of said rotary shaft to be capable of restraining rotation of the rotary shaft, said locking means configured to be capable of selecting a first position fixing rotation of said rotary shaft irrespective of a position of said movable shaft and a second position liberating rotation of said rotary shaft;
wherein said safety means includes a trigger means mechanically operating said locking means so that said locking means restrains said rotary shaft when said movable shaft moves beyond the predetermined position;
wherein said trigger means includes a detection mechanism for mechanically detecting a moving end of said movable shaft, and a link mechanism setting said locking means on the first position by said detection mechanism when said movable shaft moves beyond the predetermined position; and
wherein said locking means includes;
a fixed lock ring provided around said rotary shaft and including a groove portion having such a sliding surface that the distance between said sliding surface and the center of said rotary shaft gradually shortens along a prescribed rotational direction of said rotary shaft on a side facing said rotary shaft, a lock pin arranged in said groove portion, and a movable lock ring holding said lock pin to be movable between a first position locating said lock pin between a surface of said sliding surface most shortening the distance between said sliding surface and said rotary shaft and restraining rotation of said rotary shaft by a wedge effect and a second position liberating rotation of said rotary shaft in said groove portion.
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Abstract
This injector head 1000 comprises a plunger 20 capable of reciprocating in a direction of movement of a piston 1a in a syringe 1, a plunger drive 500 for converting rotary motion of a plunger motor 2 to linear motion in order to supply reciprocation to this plunger 20, and a safety device 600 as safety means for restraining rotation of a rotary shaft 2a of the plunger motor 2 when the plunger 20 moves beyond a predetermined position. Thus, it is possible to provide a medical injector head attaining miniaturization and simplification of the apparatus while keeping a mechanical safety mechanism.
10 Citations
9 Claims
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1. A mechanical locking mechanism comprising:
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a drive having a rotary shaft;
a moveable shaft capable of linear motion;
movable shaft drive means for converting rotary motion of the drive to motion of a prescribed direction in order to supply linear motion to said movable shaft; and
safety means for restraining rotation of the rotary shaft of said drive by a mechanical operation when said movable shaft moves beyond a predetermined position;
wherein said safety means includes a locking means provided in the vicinity of said rotary shaft to be capable of restraining rotation of the rotary shaft, said locking means configured to be capable of selecting a first position fixing rotation of said rotary shaft irrespective of a position of said movable shaft and a second position liberating rotation of said rotary shaft;
wherein said safety means includes a trigger means mechanically operating said locking means so that said locking means restrains said rotary shaft when said movable shaft moves beyond the predetermined position;
wherein said trigger means includes a detection mechanism for mechanically detecting a moving end of said movable shaft, and a link mechanism setting said locking means on the first position by said detection mechanism when said movable shaft moves beyond the predetermined position; and
wherein said locking means includes;
a fixed lock ring provided around said rotary shaft and including a groove portion having such a sliding surface that the distance between said sliding surface and the center of said rotary shaft gradually shortens along a prescribed rotational direction of said rotary shaft on a side facing said rotary shaft, a lock pin arranged in said groove portion, and a movable lock ring holding said lock pin to be movable between a first position locating said lock pin between a surface of said sliding surface most shortening the distance between said sliding surface and said rotary shaft and restraining rotation of said rotary shaft by a wedge effect and a second position liberating rotation of said rotary shaft in said groove portion.
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2. A mechanical locking mechanism comprising:
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a drive having a rotary shaft;
a moveable shaft capable of linear motion;
movable shaft drive means for converting rotary motion of the drive to motion of a prescribed direction in order to supply linear motion to said movable shaft; and
safety means for restraining rotation of the rotary shaft of said drive by a mechanical operation when said movable shaft moves beyond a predetermined position;
wherein said safety means includes a locking means provided in the vicinity of said rotary shaft to be capable of restraining rotation of the rotary shaft, said locking means configured to be capable of selecting a first position fixing rotation of said rotary shaft irrespective of a position of said movable shaft and a second position liberating rotation of said rotary shaft;
wherein said safety means includes a trigger means mechanically operating said locking means so that said locking means restrains said rotary shaft when said movable shaft moves beyond the predetermined position;
wherein said trigger means includes a detection mechanism for mechanically detecting a moving end of said movable shaft, and a link mechanism setting said locking means on the first position by said detection mechanism when said movable shaft moves beyond the predetermined position; and
wherein said detection mechanism includes;
a follower rotary shaft following rotation of said drive, a body plate having the same rotation center as the rotation center of said follower rotary shaft, a first gear, having the same rotation center as the rotation center of said follower rotary shaft, to which rotation of said follower rotary shaft is transmitted through a first gear mechanism supported on the peripheral portion of said body plate, and a second gear having the same rotation center as the rotation center of said follower rotary shaft, having a specific rotation control mechanism and arranged to be opposite to said first gear, a surface of either one of said first gear and said second gear opposed to the other gear is provided with a pin projecting toward the other gear and a surface of the other gear opposed to one of the gears is provided with a ring-shaped guide slit having both end portions extending along the rotation locus of the pin to be capable of receiving said pin, and said link mechanism has;
an engaging pin provided on a movable lock ring, an operating mechanism provided to be rotatable about a prescribed axis for rotating said movable lock ring so that said lock pin is in the first position and engaging with said engaging pin, and a link bar having an end coupled to the peripheral portion of said body plate by a universal joint and another end coupled to the other end of said operating mechanism by a universal joint. - View Dependent Claims (3)
said operating mechanism has electric signal generation means converting movement of said operating mechanism to an electric signal.
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4. A mechanical locking mechanism comprising:
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a drive having a rotary shaft;
a fixed lock ring provided around said rotary shaft and capable of restraining a moveable shaft capable of linear motion and capable of restraining rotation of the rotary shaft;
movable shaft drive means for converting rotary motion of the drive to motion of a prescribed direction in order to supply linear motion to said movable shaft; and
safety means for restraining rotation of the rotary shaft of said drive by a mechanical operation when said movable shaft moves beyond a predetermined position, wherein said safety means includes a said fixed lock ring;
wherein said safety means further includes a trigger means mechanically operating said locking means so that said locking means restrains said rotary shaft when said movable shaft moves beyond the predetermined position;
wherein said locking means is provided to be capable of selecting a first position fixing rotation of said rotary shaft and a second position liberating rotation of said rotary shaft, and said trigger means includes;
a detection mechanism for mechanically detecting a moving end of said movable shaft, and a link mechanism setting said locking means on the first position by said detection mechanism when said movable shaft moves beyond the predetermined position; and
wherein said detection mechanism includes;
a follower rotary shaft following rotation of said drive, a body plate having the same rotation center as the rotation center of said follower rotary shaft, a first gear, having the same rotation center as the rotation center of said follower rotary shaft, to which rotation of said follower rotary shaft is transmitted through a first gear mechanism supported on the peripheral portion of said body plate, and a second gear having the same rotation center as the rotation center of said follower rotary shaft, having a specific rotation control mechanism and arranged to be opposite to said first gear, a surface of either one of said first gear and said second gear opposed to the other gear is provided with a pin projecting toward the other gear and a surface of the other gear opposed to one of the gears is provided with a ring-shaped guide slit having both end portions extending along the rotation locus of the pin to be capable of receiving said pin, and said link mechanism has;
an engaging pin provided on a movable lock ring, an operating mechanism provided to be rotatable about a prescribed axis for rotating said movable lock ring so that said lock pin is in the first position and engaging with said engaging pin, and a link bar having an end coupled to the peripheral portion of said body plate by a universal joint and another end coupled to the other end of said operating mechanism by a universal joint. - View Dependent Claims (5)
said operating mechanism has electric signal generation means converting movement of said operating mechanism to an electric signal.
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6. A mechanical locking mechanism, comprising:
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a drive having a rotary shaft;
a fixed lock ring provided around said rotary shaft capable of restraining a moveable shaft capable of linear motion;
movable shaft drive means for converting rotary motion of the drive to motion of a prescribed direction in order to supply linear motion to said movable shaft; and
safety means for restraining rotation of the rotary shaft of said drive by a mechanical operation when said movable shaft moves beyond a predetermined position, wherein said safety means includes;
said fixed lock ring including a groove portion having such a sliding surface that the distance between said sliding surface and the center of said rotary shaft gradually shortens along a prescribed rotational direction of said rotary shaft on a side facing said rotary shaft, a lock pin arranged in said groove portion, and a movable lock ring holding said lock pin to be movable between a first position locating said lock pin between a surface of said sliding surface most shortening the distance between said sliding surface and said rotary shaft and restraining rotation of said rotary shaft by a wedge effect and a second position liberating rotation of said rotary shaft in said groove portion. - View Dependent Claims (7, 8, 9)
said safety means further includes a trigger means mechanically operating said locking means so that said locking means restrains said rotary shaft when said movable shaft moves beyond the predetermined position. -
8. The mechanical locking mechanism according to claim 7,
wherein said locking means is provided to be capable of selecting a first position fixing rotation of said rotary shaft and a second position liberating rotation of said rotary shaft, and said trigger means includes: -
a detection mechanism for mechanically detecting a moving end of said movable shaft, and a link mechanism setting said locking means on the first position by said detection mechanism when said movable shaft moves beyond the predetermined position.
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9. The mechanical locking mechanism according to claim 6, wherein
said detection means has means limiting the stroke of said movable shaft.
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Specification